We demonstrate InP-based triangular and hexagonal two-dimensional (2-D) planar photonic bandgap (PGB) crystal-based microcavities, positioned on a suspended membrane. Photoluminescence spectra of the structure clearly show well-resolved cavity modes, whose structure depends on the cavity shape. Q -factors from 200 up to at least 900 are derived.
P. Pottier, C. Seassal, X. Letartre, J. L. Leclercq, P. Viktorovitch, D. Cassagne, and C. Jouanin, "Triangular and Hexagonal High Q-Factor 2-D Photonic Bandgap Cavities on III-V Suspended Membranes," J. Lightwave Technol. 17, 2058- (1999)